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附图所示的炉子,由铆制的铁壳⑥和下面联结的铁圈⑦以及铸铁箱⑧组成。在炉壳⑥上接近铁圈的下部,开有四个带闸板的窗孔⑨,以便将偶然混入炉中的大块石英
The furnace shown in the drawing consists of a riveted iron shell ⑥ and an iron ring ⑦ linked below and a cast iron box ⑧. In the lower part of the furnace shell ⑥ close to the iron ring, opened with four shutter holes ⑨, in order to accidentally mixed into the furnace of large quartz